feat: Add support for minutes in auto resolve feature (#11269)

### Summary

- Converts conversation auto-resolution duration from days to minutes
for more
granular control
- Updates validation to allow values from 10 minutes (minimum) to 999
days (maximum)
- Implements smart messaging to show appropriate time units in activity
messages

###  Changes

- Created migration to convert existing durations from days to minutes
(x1440)
- Updated conversation resolver to use minutes instead of days
- Added dynamic translation key selection based on duration value
- Updated related specs and documentation
- Added support for displaying durations in days, hours, or minutes
based on value

###  Test plan

- Verify account validation accepts new minute-based ranges
- Confirm existing account settings are correctly migrated
- Test auto-resolution works properly with minute values
- Ensure proper time unit display in activity messages

---------

Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>

app/models/concerns/activity_message_handler.rb

@@ -56,13 +56,24 @@ module ActivityMessageHandler
     ::Conversations::ActivityMessageJob.perform_later(self, activity_message_params(content)) if content
   end
 
+  def auto_resolve_message_key(minutes)
+    if minutes >= 1440 && (minutes % 1440).zero?
+      { key: 'auto_resolved_days', count: minutes / 1440 }
+    elsif minutes >= 60 && (minutes % 60).zero?
+      { key: 'auto_resolved_hours', count: minutes / 60 }
+    else
+      { key: 'auto_resolved_minutes', count: minutes }
+    end
+  end
+
   def user_status_change_activity_content(user_name)
     if user_name
       I18n.t("conversations.activity.status.#{status}", user_name: user_name)
     elsif Current.contact.present? && resolved?
       I18n.t('conversations.activity.status.contact_resolved', contact_name: Current.contact.name.capitalize)
     elsif resolved?
-      I18n.t('conversations.activity.status.auto_resolved', duration: auto_resolve_duration)
+      message_data = auto_resolve_message_key(auto_resolve_after || 0)
+      I18n.t("conversations.activity.status.#{message_data[:key]}", count: message_data[:count])
     end
   end